88 IOWA STUDIES IN NATURAL HISTORY 
These tend to a linear arrangement in very shallow grooves on 
some parts of the surface. The dactylopores are arranged around 
the gastropores and between the petals. There is evidently a style 
to each gastropore. The largest colony secured is about seven 
inches high and profusely branched. 
Distichopora is represented by small branched colonies. The 
branches are rounder than in specimens from the Atlantic and 
have a purplish tinge. The edge of each branch has a deep 
groove along its whole length and the gastropores are arranged 
along the bottom of the grooves, while the dactylopores occupy 
the ridges on either side. The general surface seems to be largely 
devoid of the blister-like swellings found on our West Indian 
specimens. A majority of the specimens collected at Makuluva are 
a pretty blue, rather than purple, almost the color of the large 
starfish LIinckia, although a somewhat darker blue, and the tips 
of the branches are often almost white. Some specimens have the 
short, stubby branches on opposite sides and strictly alternate. 
None of them is over two inches in height. In addition to the gas- 
tropores and dactylopores along the grooves on the edges of the 
branches, there appear to be others on the surfaces and in one 
specimen at least the zooids themselves are seen in a regular 
cyclosystem. This would doubtless place the species in another 
genus, a description of which I am unable to find. 
We found no ordinary hydroid colonies at Makuluva. This is, 
I believe, the first place where I have failed to find material be- 
longing to this group. 
Numerous sponges were also found, but nothing that seems to 
be worthy of special mention. 
